Why is XAMPP slow?

Question

xampp

There is a grid consisting of 20 computers. I installed XAMPP on one computer and threw a self-written script there. And so at the address to it through the browser terribly slows down. Pages open at intervals of 30-40 seconds. Although on other networks I tried the pages opened normally. The strange thing is that the car has good parameters. Is it possible to somehow speed up XAMPP under Windows. I don't want to install Linux